CBI sources said that the agency has not found sufficient evidence to prosecute Raja Bhaiya. The agency will seek merging of the FIR filed by Haq's wife Parveen Azad, in which Raja Bhaiya was made an accused, with the one filed by Uttar Pradesh Police in connection with the violence and murders, as two cases for the same crime are not sustainable.

The agency has filed its chargesheet in connection with the murder, but did not name Raja Bhaiya as accused. The former food and civil supplies minister was questioned by the CBI on May 15 and 16.

He was also subjected to a polygraph test on June 20 at the Central Forensic Laboratory. Haq was shot dead on March 2 in Balipur village in Kunda area of Pratapgarh district where he had gone to probe murder of village head Nanhe Yadav.

Haq's wife Parveen Azad had accused Raja Bhaiya of being involved in his murder, after which the former minister had to resign from the Cabinet on March 4.